Need laptop buying guide

I want to buy an used laptop and i need your help to chose one.
From youtube and blog I have managed some info. Like.

1. More Cores,
2. Turbo boost tec.
3. Higher Clock speed.
4. More ram with more BUS
5. Ssd over hdd
6. GPU with more GB.

Now help which one is the most part of Laptop. What things should i check in spec before buying one.

My main purpose is Photo editing and Video editing(Small HD).

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